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Does the unit heat/cool the way it should? Since you contracted for a 3 stage unit, you will have a bargaining chip. If you are comfortable with the unit you have, you may want to talk to the installer about refunding the difference.

I have never been lost, but I will admit to being confused for several weeks.-Daniel Boone-

Little diffrence between 3 stage to 2 stage if you like the 2stage keep it. Have them either throw something new in the deal like a hassle free 10 yrs parts & labor warranty or some nice UV lights or a possible reinbursment for diffrence. If you do keep have the re-write contract with new prices m/n & s/n. Either way you got a new Carrier & life is good

WARNING:IF YOU DON'T KNOW THEN DON'T DO, SO THOSE WHO KNOW WHAT YOU DIDN'T KNOW DON'T END UP UNDOING WHAT YOU DID SO IT COULD GET DONE RIGHT!